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CVE-2013-2850 iscsi-target: heap buffer overflow on large key error (rhbz 968036 969272)

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Josh Boyer 2013-05-31 07:33:17 -04:00
parent dc6ef3598c
commit 613531314d
2 changed files with 72 additions and 0 deletions
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63
iscsi-target-fix-heap-buffer-overflow-on-error.patch Normal file
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@ -0,0 +1,63 @@
From cea4dcfdad926a27a18e188720efe0f2c9403456 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Thu, 23 May 2013 17:32:17 +0000
Subject: iscsi-target: fix heap buffer overflow on error
If a key was larger than 64 bytes, as checked by iscsi_check_key(), the
error response packet, generated by iscsi_add_notunderstood_response(),
would still attempt to copy the entire key into the packet, overflowing
the structure on the heap.
Remote preauthentication kernel memory corruption was possible if a
target was configured and listening on the network.
CVE-2013-2850
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index c2185fc..e382221 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -758,9 +758,9 @@ static int iscsi_add_notunderstood_response(
}
INIT_LIST_HEAD(&extra_response->er_list);
- strncpy(extra_response->key, key, strlen(key) + 1);
- strncpy(extra_response->value, NOTUNDERSTOOD,
- strlen(NOTUNDERSTOOD) + 1);
+ strlcpy(extra_response->key, key, sizeof(extra_response->key));
+ strlcpy(extra_response->value, NOTUNDERSTOOD,
+ sizeof(extra_response->value));
list_add_tail(&extra_response->er_list,
&param_list->extra_response_list);
@@ -1629,8 +1629,6 @@ int iscsi_decode_text_input(
if (phase & PHASE_SECURITY) {
if (iscsi_check_for_auth_key(key) > 0) {
- char *tmpptr = key + strlen(key);
- *tmpptr = '=';
kfree(tmpbuf);
return 1;
}
diff --git a/drivers/target/iscsi/iscsi_target_parameters.h b/drivers/target/iscsi/iscsi_target_parameters.h
index 915b067..a47046a 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.h
+++ b/drivers/target/iscsi/iscsi_target_parameters.h
@@ -1,8 +1,10 @@
#ifndef ISCSI_PARAMETERS_H
#define ISCSI_PARAMETERS_H
+#include <scsi/iscsi_proto.h>
+
struct iscsi_extra_response {
- char key[64];
+ char key[KEY_MAXLEN];
char value[32];
struct list_head er_list;
} ____cacheline_aligned;
--
cgit v0.9.2

9
kernel.spec
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@ -761,6 +761,9 @@ Patch25023: hp-wmi-fix-incorrect-rfkill-set-hw-state.patch
#rhbz 948262
Patch25024: intel_iommu-Downgrade-the-warning-if-enabling-irq-remapping-fails.patch
#CVE-2013-2850 rhbz 968036 969272
Patch25025: iscsi-target-fix-heap-buffer-overflow-on-error.patch
# END OF PATCH DEFINITIONS
%endif
@ -1469,6 +1472,9 @@ ApplyPatch hp-wmi-fix-incorrect-rfkill-set-hw-state.patch
#rhbz 948262
ApplyPatch intel_iommu-Downgrade-the-warning-if-enabling-irq-remapping-fails.patch
#CVE-2013-2850 rhbz 968036 969272
ApplyPatch iscsi-target-fix-heap-buffer-overflow-on-error.patch
# END OF PATCH APPLICATIONS
%endif
@ -2296,6 +2302,9 @@ fi
# and build.
%changelog
* Fri May 31 2013 Josh Boyer <jwboyer@redhat.com>
- CVE-2013-2850 iscsi-target: heap buffer overflow on large key error (rhbz 968036 969272)
* Thu May 30 2013 Peter Robinson <pbrobinson@fedoraproject.org>
- Update ARM tegra config